Supplement comparisons and buying guides
Updated 4 November 2026 · By Root & Evidence Editorial · No independent clinical review claimed
Start with the decision in front of you. If you have two bottles, open a comparison below. If you have one bottle and a question about its claims, start with the label and testing guides. For a closer look at what an ingredient did in clinical trials, browse the supplement library.
Compare supplement forms
Match the two products to a reason for taking them. These comparisons explain which formulations human trials tested, what researchers measured, and how to read two labels side by side.
Understand a bottle before you buy
Begin with the amount per serving, then check what the manufacturer can document. A label, an independent certificate, and a clinical trial each answer a different question about the same product.
Prepare for a medication review
If you already take medicines, start with the safety question. A photo of the label and a list of what you actually use will help your pharmacist check the specific combination.